Stay-bolt structure for boilers.



C. HYLAND. STAY BOLT STRUCTURE FOR BOHERS.

APPLICATION FILED FEB- 26 1915' L fi gm Patented Apr. 10, 1917.

WIT/VESSE S W #6 l/VVENTOR JM UNTTED %TATl lt-l PATENT CHARLES I-IYLAND, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOB TO FLANNERY BOLT COMPANY. 016 PITTSBURGH, PENNSYLVANIA.

STAYeBOLT STRUCTURE FOR BOILERS.

WW 11 222 2592 Specification of Letters Yatent. Pfltggntgfl App 141) tow Application filed February 26, 1916. Serial 1%. 80,689.

To all whom it may concern: by an annular face or shoulder 8 is formed Be it known that 1, CHARLES HYLAND, a on the end of the latter at right angles to citizen of the United States, and a resident the axis of the bolt, and upon said beveled of Pittsburgh, in the county of Allegheny enlargement, an angular extension 9 is and State of Pennsylvania, have invented formed.

certain new and useful Improvements in An annular cap 10 of spring-metal, bent Stay-Bolt Structures for Boilers; and I do partially upon itself so that it shall comprise hereby declare the following to be a full, two oppositely disposed members and posclear, and exact description of the invention, sess adequate resiliency or flexibility, encirsuch as will enable others skilled in the art cles the head of the bolt so that its inner to which it appertains to make and use the edge 11 will rest against the flat annular same. shoulder 8 of said bolt head,-the edge 12 This invention relates to improvements in of the outer fold or member of said cap bestay bolt structures for boilers,one object ing disposed in a groove 13 in the outer 5 of the invention being to provide a simple face of the boiler sheet 5. The groove 13 device for connecting the head of a stay bolt serves as convenient centering means for the with the outer boiler sheet in such manner cap relatively to the bolt, and it also serves as normally to retain the head of the bolt to receive material whereby the flexible cap on its seat with yielding pressure and to peris welded to the boiler sheet 5 as indicated at mit slight longitudinal and lateral movel l. The inner edge portion of the inner t f th b lt d ent undue strain fold of the annular flexible cap is welded, as

upon ith r f th b iler heets through at 16 to the beveled shoulder 7 on the bolt which the stay bolt passes. h

A further object is to provide, in a boiler In the form of the invention shown in Fig.

25 stay bolt structure, ayielding device con- 2, the head 3 of the bolt is shown as being necting one end of the bolt with the outer spherical and provided with an annular b il h t d t so construct id d vice shoulder 17 upon which one edge of the annuthat it QXPQSQ, the tell-tale hole of the i111 flexible Cup 10 1"3StS,-th other GdgG Of b lt d l id it steam d w t r said cap rest ng against the outer boiler 3e ti ht connection b t th h d f th t sheet 5. In this construction, one edge of the bolt and the outer face of the outer boiler cap 1s Welded to the spherical head of the sheet. bolt, as indicated at 18, while the other edge With these and other objects in view, th of said cap is welded to the face of the outer invention consists in certain novel features boiler sheet 5, as shown at 19,

3.5 of construction and combinations of parts as In both forms of the invention, the flexible hereinafter set forth and pointed out in the or resilient cap 10 will permit suflicient play claims. of the bolt head in the outer boiler sheet In the accompanying drawings; Figure 1 to compensate for relative movements of the is a sectional view illustrating an applicaboiler sheets due to expansion and contrac- 40 tion of my improvements, and Fig. 2 is a sec t1on, and at the same time efiect a water and tional view showing a modification. steam tight connection between the bolt head 1 represents a stay bolt having one of its and the outer boiler sheet. While performend d ted for tt chment to th in ing these functions, the resilient cap also eX- sheet 2 of a fire box or boiler and the outer poses the tell-tale hole of the bolt. 5 end of this bolt is rovided with a head 3 If desired, the resilient cap may contain 10G which, as shown in Fig, 1 may b partly lubricant wh1ch will find its way between spherical and may also be provided with a, the bolt head and itsbearing in the hOllGl' tell-tale 4;. The head 3 passes through a hole sheet 5 and serve to protect the bearing surin the outer boiler plate 5 and a portion of faces and insure the fleXihility 0f the 0011- the wall of this hole affords a bearing 6 for nection of the bolt with the boiler sheet. the partly spherical head of the bolt. I do not claim in this case, broadly, a The head of the bolt is made with an yielding cap to encircle the head of a stay enlargement forming a shoulder 7 and havbolt and comprising a part secured to the ing less diameter than that of the adjacent boiler sheet and a part pressing against the 55 partly spherical portion of the head, wherestay bolt in an 1nward direction,-such con- 1w 'deta in copending ap- B. Stafford and 29, 1916, Serial struction being claimed plication filed by D. E. Ethan I. Dodds, February No. 81,260.

Various slight changes might be made in ils of construction of my invention without departing from the spirit thereof or limiting its scope and hence I do not wish of the appended claims.

Iaving fully described my invention What claim as new and desire to secure by Let ters-Patent, is

1. In a stay bolt structure, the combination with a boiler sheet and a stay bolthaving a head mounted therein, of a flexible metal cap secured at one edge to the boiler sheet and secured at its other edge to the head of the bolt and normally pressing against the same in a direction parallel to the axis of the bolt.

2. In a stay bolt structure, the combination with a boiler sheet and a stay bolt having a head mounted therein, of an annular flexible cap encircling the bolt head and welded at its respective edges to the boiler sheet and to said bolt head.

3. In a stay bolt structure, the combina tion with a boiler sheet and a stay bolt having a head mounted therein, said head having a head ing an annular shoulder, of an annular flexi- Copies of this patent may be obtained for five cents each, by

ble cap having one edge bearing against the shoulder on the bolt head and welded to the latter the other edge of said annular flexible cap being welded to the boiler sheet.

5. In a stay bolt structure the combination with a boiler sheet and a ing a head mounted in said said boiler sheet having an annular groove in its outer face surrounding the bearing of the bolt head, of an annular flexible cap having one edge secured in the annular groove in the boiler sheet and having its other edge bearing against the head of the stay bolt.

6. In a stay bolt structure, the combination with a boiler sheet and a stay bolt having a head mounted in said boiler sheet, of an annular sitely disposed members, means securing the edge of one member to the boiler sheet, and means securing the edge of the other member to the head of the bolt.

In a stay bolt structure, the combination With a boiler sheet and a stay bolt having a head mounted in saidboiler sheet, of an annular flexible cap comprising two oppositely disposed members forming a chamber between them, the edge of one of said members secured to the bolt head and the edge of the other member of said cap secured to the boiler sheet, and lubricant Within the chamber formed in said cap.

In testimony whereof, I have signed this specification in the presence of two subscribing witnesses.

CHARLES HYLAN D.

Witnesses:

F. H. ALLIsoN, EDWIN S. RYoE.

addressing the Commissioner of Patents,

Washington, D. C.

flexible cap having two oppo- 

